Toddler's diarrhoea is a common cause of chronic (persistent) diarrhoea in young children. It mainly affects children between the ages of 1 and 5 years and is more common in boys. Toddler's diarrhoea is not serious and the child is well. The diarrhoea will go as the child becomes older. The diet of young children is often not ideal and is thought to contribute to the cause. The diarrhoea will often stop if the child: has a good amount of fat in the diet (whole milk, etc); does not drink too much fruit juice or squash; has meals that include a normal amount of fibre (but not a high-fibre diet).